msi.c revision 1edab4a164b229807853682f7ff7858c11dd3481
1/* 2 * File: msi.c 3 * Purpose: PCI Message Signaled Interrupt (MSI) 4 * 5 * Copyright (C) 2003-2004 Intel 6 * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com) 7 */ 8 9#include <linux/mm.h> 10#include <linux/irq.h> 11#include <linux/interrupt.h> 12#include <linux/init.h> 13#include <linux/config.h> 14#include <linux/ioport.h> 15#include <linux/smp_lock.h> 16#include <linux/pci.h> 17#include <linux/proc_fs.h> 18 19#include <asm/errno.h> 20#include <asm/io.h> 21#include <asm/smp.h> 22 23#include "pci.h" 24#include "msi.h" 25 26static DEFINE_SPINLOCK(msi_lock); 27static struct msi_desc* msi_desc[NR_IRQS] = { [0 ... NR_IRQS-1] = NULL }; 28static kmem_cache_t* msi_cachep; 29 30static int pci_msi_enable = 1; 31static int last_alloc_vector; 32static int nr_released_vectors; 33static int nr_reserved_vectors = NR_HP_RESERVED_VECTORS; 34static int nr_msix_devices; 35 36#ifndef CONFIG_X86_IO_APIC 37int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1}; 38u8 irq_vector[NR_IRQ_VECTORS]; 39#endif 40 41static struct msi_ops *msi_ops; 42 43int 44msi_register(struct msi_ops *ops) 45{ 46 msi_ops = ops; 47 return 0; 48} 49 50static void msi_cache_ctor(void *p, kmem_cache_t *cache, unsigned long flags) 51{ 52 memset(p, 0, NR_IRQS * sizeof(struct msi_desc)); 53} 54 55static int msi_cache_init(void) 56{ 57 msi_cachep = kmem_cache_create("msi_cache", 58 NR_IRQS * sizeof(struct msi_desc), 59 0, SLAB_HWCACHE_ALIGN, msi_cache_ctor, NULL); 60 if (!msi_cachep) 61 return -ENOMEM; 62 63 return 0; 64} 65 66static void msi_set_mask_bit(unsigned int vector, int flag) 67{ 68 struct msi_desc *entry; 69 70 entry = (struct msi_desc *)msi_desc[vector]; 71 if (!entry || !entry->dev || !entry->mask_base) 72 return; 73 switch (entry->msi_attrib.type) { 74 case PCI_CAP_ID_MSI: 75 { 76 int pos; 77 u32 mask_bits; 78 79 pos = (long)entry->mask_base; 80 pci_read_config_dword(entry->dev, pos, &mask_bits); 81 mask_bits &= ~(1); 82 mask_bits |= flag; 83 pci_write_config_dword(entry->dev, pos, mask_bits); 84 break; 85 } 86 case PCI_CAP_ID_MSIX: 87 { 88 int offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE + 89 PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET; 90 writel(flag, entry->mask_base + offset); 91 break; 92 } 93 default: 94 break; 95 } 96} 97 98#ifdef CONFIG_SMP 99static void set_msi_affinity(unsigned int vector, cpumask_t cpu_mask) 100{ 101 struct msi_desc *entry; 102 u32 address_hi, address_lo; 103 unsigned int irq = vector; 104 unsigned int dest_cpu = first_cpu(cpu_mask); 105 106 entry = (struct msi_desc *)msi_desc[vector]; 107 if (!entry || !entry->dev) 108 return; 109 110 switch (entry->msi_attrib.type) { 111 case PCI_CAP_ID_MSI: 112 { 113 int pos = pci_find_capability(entry->dev, PCI_CAP_ID_MSI); 114 115 if (!pos) 116 return; 117 118 pci_read_config_dword(entry->dev, msi_upper_address_reg(pos), 119 &address_hi); 120 pci_read_config_dword(entry->dev, msi_lower_address_reg(pos), 121 &address_lo); 122 123 msi_ops->target(vector, dest_cpu, &address_hi, &address_lo); 124 125 pci_write_config_dword(entry->dev, msi_upper_address_reg(pos), 126 address_hi); 127 pci_write_config_dword(entry->dev, msi_lower_address_reg(pos), 128 address_lo); 129 set_native_irq_info(irq, cpu_mask); 130 break; 131 } 132 case PCI_CAP_ID_MSIX: 133 { 134 int offset_hi = 135 entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE + 136 PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET; 137 int offset_lo = 138 entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE + 139 PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET; 140 141 address_hi = readl(entry->mask_base + offset_hi); 142 address_lo = readl(entry->mask_base + offset_lo); 143 144 msi_ops->target(vector, dest_cpu, &address_hi, &address_lo); 145 146 writel(address_hi, entry->mask_base + offset_hi); 147 writel(address_lo, entry->mask_base + offset_lo); 148 set_native_irq_info(irq, cpu_mask); 149 break; 150 } 151 default: 152 break; 153 } 154} 155#else 156#define set_msi_affinity NULL 157#endif /* CONFIG_SMP */ 158 159static void mask_MSI_irq(unsigned int vector) 160{ 161 msi_set_mask_bit(vector, 1); 162} 163 164static void unmask_MSI_irq(unsigned int vector) 165{ 166 msi_set_mask_bit(vector, 0); 167} 168 169static unsigned int startup_msi_irq_wo_maskbit(unsigned int vector) 170{ 171 struct msi_desc *entry; 172 unsigned long flags; 173 174 spin_lock_irqsave(&msi_lock, flags); 175 entry = msi_desc[vector]; 176 if (!entry || !entry->dev) { 177 spin_unlock_irqrestore(&msi_lock, flags); 178 return 0; 179 } 180 entry->msi_attrib.state = 1; /* Mark it active */ 181 spin_unlock_irqrestore(&msi_lock, flags); 182 183 return 0; /* never anything pending */ 184} 185 186static unsigned int startup_msi_irq_w_maskbit(unsigned int vector) 187{ 188 startup_msi_irq_wo_maskbit(vector); 189 unmask_MSI_irq(vector); 190 return 0; /* never anything pending */ 191} 192 193static void shutdown_msi_irq(unsigned int vector) 194{ 195 struct msi_desc *entry; 196 unsigned long flags; 197 198 spin_lock_irqsave(&msi_lock, flags); 199 entry = msi_desc[vector]; 200 if (entry && entry->dev) 201 entry->msi_attrib.state = 0; /* Mark it not active */ 202 spin_unlock_irqrestore(&msi_lock, flags); 203} 204 205static void end_msi_irq_wo_maskbit(unsigned int vector) 206{ 207 move_native_irq(vector); 208 ack_APIC_irq(); 209} 210 211static void end_msi_irq_w_maskbit(unsigned int vector) 212{ 213 move_native_irq(vector); 214 unmask_MSI_irq(vector); 215 ack_APIC_irq(); 216} 217 218static void do_nothing(unsigned int vector) 219{ 220} 221 222/* 223 * Interrupt Type for MSI-X PCI/PCI-X/PCI-Express Devices, 224 * which implement the MSI-X Capability Structure. 225 */ 226static struct hw_interrupt_type msix_irq_type = { 227 .typename = "PCI-MSI-X", 228 .startup = startup_msi_irq_w_maskbit, 229 .shutdown = shutdown_msi_irq, 230 .enable = unmask_MSI_irq, 231 .disable = mask_MSI_irq, 232 .ack = mask_MSI_irq, 233 .end = end_msi_irq_w_maskbit, 234 .set_affinity = set_msi_affinity 235}; 236 237/* 238 * Interrupt Type for MSI PCI/PCI-X/PCI-Express Devices, 239 * which implement the MSI Capability Structure with 240 * Mask-and-Pending Bits. 241 */ 242static struct hw_interrupt_type msi_irq_w_maskbit_type = { 243 .typename = "PCI-MSI", 244 .startup = startup_msi_irq_w_maskbit, 245 .shutdown = shutdown_msi_irq, 246 .enable = unmask_MSI_irq, 247 .disable = mask_MSI_irq, 248 .ack = mask_MSI_irq, 249 .end = end_msi_irq_w_maskbit, 250 .set_affinity = set_msi_affinity 251}; 252 253/* 254 * Interrupt Type for MSI PCI/PCI-X/PCI-Express Devices, 255 * which implement the MSI Capability Structure without 256 * Mask-and-Pending Bits. 257 */ 258static struct hw_interrupt_type msi_irq_wo_maskbit_type = { 259 .typename = "PCI-MSI", 260 .startup = startup_msi_irq_wo_maskbit, 261 .shutdown = shutdown_msi_irq, 262 .enable = do_nothing, 263 .disable = do_nothing, 264 .ack = do_nothing, 265 .end = end_msi_irq_wo_maskbit, 266 .set_affinity = set_msi_affinity 267}; 268 269static int msi_free_vector(struct pci_dev* dev, int vector, int reassign); 270static int assign_msi_vector(void) 271{ 272 static int new_vector_avail = 1; 273 int vector; 274 unsigned long flags; 275 276 /* 277 * msi_lock is provided to ensure that successful allocation of MSI 278 * vector is assigned unique among drivers. 279 */ 280 spin_lock_irqsave(&msi_lock, flags); 281 282 if (!new_vector_avail) { 283 int free_vector = 0; 284 285 /* 286 * vector_irq[] = -1 indicates that this specific vector is: 287 * - assigned for MSI (since MSI have no associated IRQ) or 288 * - assigned for legacy if less than 16, or 289 * - having no corresponding 1:1 vector-to-IOxAPIC IRQ mapping 290 * vector_irq[] = 0 indicates that this vector, previously 291 * assigned for MSI, is freed by hotplug removed operations. 292 * This vector will be reused for any subsequent hotplug added 293 * operations. 294 * vector_irq[] > 0 indicates that this vector is assigned for 295 * IOxAPIC IRQs. This vector and its value provides a 1-to-1 296 * vector-to-IOxAPIC IRQ mapping. 297 */ 298 for (vector = FIRST_DEVICE_VECTOR; vector < NR_IRQS; vector++) { 299 if (vector_irq[vector] != 0) 300 continue; 301 free_vector = vector; 302 if (!msi_desc[vector]) 303 break; 304 else 305 continue; 306 } 307 if (!free_vector) { 308 spin_unlock_irqrestore(&msi_lock, flags); 309 return -EBUSY; 310 } 311 vector_irq[free_vector] = -1; 312 nr_released_vectors--; 313 spin_unlock_irqrestore(&msi_lock, flags); 314 if (msi_desc[free_vector] != NULL) { 315 struct pci_dev *dev; 316 int tail; 317 318 /* free all linked vectors before re-assign */ 319 do { 320 spin_lock_irqsave(&msi_lock, flags); 321 dev = msi_desc[free_vector]->dev; 322 tail = msi_desc[free_vector]->link.tail; 323 spin_unlock_irqrestore(&msi_lock, flags); 324 msi_free_vector(dev, tail, 1); 325 } while (free_vector != tail); 326 } 327 328 return free_vector; 329 } 330 vector = assign_irq_vector(AUTO_ASSIGN); 331 last_alloc_vector = vector; 332 if (vector == LAST_DEVICE_VECTOR) 333 new_vector_avail = 0; 334 335 spin_unlock_irqrestore(&msi_lock, flags); 336 return vector; 337} 338 339static int get_new_vector(void) 340{ 341 int vector = assign_msi_vector(); 342 343 if (vector > 0) 344 set_intr_gate(vector, interrupt[vector]); 345 346 return vector; 347} 348 349static int msi_init(void) 350{ 351 static int status = -ENOMEM; 352 353 if (!status) 354 return status; 355 356 if (pci_msi_quirk) { 357 pci_msi_enable = 0; 358 printk(KERN_WARNING "PCI: MSI quirk detected. MSI disabled.\n"); 359 status = -EINVAL; 360 return status; 361 } 362 363 status = msi_arch_init(); 364 if (status < 0) { 365 pci_msi_enable = 0; 366 printk(KERN_WARNING 367 "PCI: MSI arch init failed. MSI disabled.\n"); 368 return status; 369 } 370 371 if (! msi_ops) { 372 printk(KERN_WARNING 373 "PCI: MSI ops not registered. MSI disabled.\n"); 374 status = -EINVAL; 375 return status; 376 } 377 378 last_alloc_vector = assign_irq_vector(AUTO_ASSIGN); 379 status = msi_cache_init(); 380 if (status < 0) { 381 pci_msi_enable = 0; 382 printk(KERN_WARNING "PCI: MSI cache init failed\n"); 383 return status; 384 } 385 386#ifndef CONFIG_X86_IO_APIC 387 irq_vector[0] = FIRST_DEVICE_VECTOR; 388#endif 389 390 if (last_alloc_vector < 0) { 391 pci_msi_enable = 0; 392 printk(KERN_WARNING "PCI: No interrupt vectors available for MSI\n"); 393 status = -EBUSY; 394 return status; 395 } 396 vector_irq[last_alloc_vector] = 0; 397 nr_released_vectors++; 398 399 return status; 400} 401 402static int get_msi_vector(struct pci_dev *dev) 403{ 404 return get_new_vector(); 405} 406 407static struct msi_desc* alloc_msi_entry(void) 408{ 409 struct msi_desc *entry; 410 411 entry = kmem_cache_alloc(msi_cachep, SLAB_KERNEL); 412 if (!entry) 413 return NULL; 414 415 memset(entry, 0, sizeof(struct msi_desc)); 416 entry->link.tail = entry->link.head = 0; /* single message */ 417 entry->dev = NULL; 418 419 return entry; 420} 421 422static void attach_msi_entry(struct msi_desc *entry, int vector) 423{ 424 unsigned long flags; 425 426 spin_lock_irqsave(&msi_lock, flags); 427 msi_desc[vector] = entry; 428 spin_unlock_irqrestore(&msi_lock, flags); 429} 430 431static void irq_handler_init(int cap_id, int pos, int mask) 432{ 433 unsigned long flags; 434 435 spin_lock_irqsave(&irq_desc[pos].lock, flags); 436 if (cap_id == PCI_CAP_ID_MSIX) 437 irq_desc[pos].handler = &msix_irq_type; 438 else { 439 if (!mask) 440 irq_desc[pos].handler = &msi_irq_wo_maskbit_type; 441 else 442 irq_desc[pos].handler = &msi_irq_w_maskbit_type; 443 } 444 spin_unlock_irqrestore(&irq_desc[pos].lock, flags); 445} 446 447static void enable_msi_mode(struct pci_dev *dev, int pos, int type) 448{ 449 u16 control; 450 451 pci_read_config_word(dev, msi_control_reg(pos), &control); 452 if (type == PCI_CAP_ID_MSI) { 453 /* Set enabled bits to single MSI & enable MSI_enable bit */ 454 msi_enable(control, 1); 455 pci_write_config_word(dev, msi_control_reg(pos), control); 456 } else { 457 msix_enable(control); 458 pci_write_config_word(dev, msi_control_reg(pos), control); 459 } 460 if (pci_find_capability(dev, PCI_CAP_ID_EXP)) { 461 /* PCI Express Endpoint device detected */ 462 pci_intx(dev, 0); /* disable intx */ 463 } 464} 465 466void disable_msi_mode(struct pci_dev *dev, int pos, int type) 467{ 468 u16 control; 469 470 pci_read_config_word(dev, msi_control_reg(pos), &control); 471 if (type == PCI_CAP_ID_MSI) { 472 /* Set enabled bits to single MSI & enable MSI_enable bit */ 473 msi_disable(control); 474 pci_write_config_word(dev, msi_control_reg(pos), control); 475 } else { 476 msix_disable(control); 477 pci_write_config_word(dev, msi_control_reg(pos), control); 478 } 479 if (pci_find_capability(dev, PCI_CAP_ID_EXP)) { 480 /* PCI Express Endpoint device detected */ 481 pci_intx(dev, 1); /* enable intx */ 482 } 483} 484 485static int msi_lookup_vector(struct pci_dev *dev, int type) 486{ 487 int vector; 488 unsigned long flags; 489 490 spin_lock_irqsave(&msi_lock, flags); 491 for (vector = FIRST_DEVICE_VECTOR; vector < NR_IRQS; vector++) { 492 if (!msi_desc[vector] || msi_desc[vector]->dev != dev || 493 msi_desc[vector]->msi_attrib.type != type || 494 msi_desc[vector]->msi_attrib.default_vector != dev->irq) 495 continue; 496 spin_unlock_irqrestore(&msi_lock, flags); 497 /* This pre-assigned MSI vector for this device 498 already exits. Override dev->irq with this vector */ 499 dev->irq = vector; 500 return 0; 501 } 502 spin_unlock_irqrestore(&msi_lock, flags); 503 504 return -EACCES; 505} 506 507void pci_scan_msi_device(struct pci_dev *dev) 508{ 509 if (!dev) 510 return; 511 512 if (pci_find_capability(dev, PCI_CAP_ID_MSIX) > 0) 513 nr_msix_devices++; 514 else if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0) 515 nr_reserved_vectors++; 516} 517 518#ifdef CONFIG_PM 519int pci_save_msi_state(struct pci_dev *dev) 520{ 521 int pos, i = 0; 522 u16 control; 523 struct pci_cap_saved_state *save_state; 524 u32 *cap; 525 526 pos = pci_find_capability(dev, PCI_CAP_ID_MSI); 527 if (pos <= 0 || dev->no_msi) 528 return 0; 529 530 pci_read_config_word(dev, msi_control_reg(pos), &control); 531 if (!(control & PCI_MSI_FLAGS_ENABLE)) 532 return 0; 533 534 save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u32) * 5, 535 GFP_KERNEL); 536 if (!save_state) { 537 printk(KERN_ERR "Out of memory in pci_save_msi_state\n"); 538 return -ENOMEM; 539 } 540 cap = &save_state->data[0]; 541 542 pci_read_config_dword(dev, pos, &cap[i++]); 543 control = cap[0] >> 16; 544 pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, &cap[i++]); 545 if (control & PCI_MSI_FLAGS_64BIT) { 546 pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, &cap[i++]); 547 pci_read_config_dword(dev, pos + PCI_MSI_DATA_64, &cap[i++]); 548 } else 549 pci_read_config_dword(dev, pos + PCI_MSI_DATA_32, &cap[i++]); 550 if (control & PCI_MSI_FLAGS_MASKBIT) 551 pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT, &cap[i++]); 552 disable_msi_mode(dev, pos, PCI_CAP_ID_MSI); 553 save_state->cap_nr = PCI_CAP_ID_MSI; 554 pci_add_saved_cap(dev, save_state); 555 return 0; 556} 557 558void pci_restore_msi_state(struct pci_dev *dev) 559{ 560 int i = 0, pos; 561 u16 control; 562 struct pci_cap_saved_state *save_state; 563 u32 *cap; 564 565 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSI); 566 pos = pci_find_capability(dev, PCI_CAP_ID_MSI); 567 if (!save_state || pos <= 0) 568 return; 569 cap = &save_state->data[0]; 570 571 control = cap[i++] >> 16; 572 pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, cap[i++]); 573 if (control & PCI_MSI_FLAGS_64BIT) { 574 pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, cap[i++]); 575 pci_write_config_dword(dev, pos + PCI_MSI_DATA_64, cap[i++]); 576 } else 577 pci_write_config_dword(dev, pos + PCI_MSI_DATA_32, cap[i++]); 578 if (control & PCI_MSI_FLAGS_MASKBIT) 579 pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT, cap[i++]); 580 pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control); 581 enable_msi_mode(dev, pos, PCI_CAP_ID_MSI); 582 pci_remove_saved_cap(save_state); 583 kfree(save_state); 584} 585 586int pci_save_msix_state(struct pci_dev *dev) 587{ 588 int pos; 589 int temp; 590 int vector, head, tail = 0; 591 u16 control; 592 struct pci_cap_saved_state *save_state; 593 594 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); 595 if (pos <= 0 || dev->no_msi) 596 return 0; 597 598 /* save the capability */ 599 pci_read_config_word(dev, msi_control_reg(pos), &control); 600 if (!(control & PCI_MSIX_FLAGS_ENABLE)) 601 return 0; 602 save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u16), 603 GFP_KERNEL); 604 if (!save_state) { 605 printk(KERN_ERR "Out of memory in pci_save_msix_state\n"); 606 return -ENOMEM; 607 } 608 *((u16 *)&save_state->data[0]) = control; 609 610 /* save the table */ 611 temp = dev->irq; 612 if (msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { 613 kfree(save_state); 614 return -EINVAL; 615 } 616 617 vector = head = dev->irq; 618 while (head != tail) { 619 int j; 620 void __iomem *base; 621 struct msi_desc *entry; 622 623 entry = msi_desc[vector]; 624 base = entry->mask_base; 625 j = entry->msi_attrib.entry_nr; 626 627 entry->address_lo_save = 628 readl(base + j * PCI_MSIX_ENTRY_SIZE + 629 PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET); 630 entry->address_hi_save = 631 readl(base + j * PCI_MSIX_ENTRY_SIZE + 632 PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET); 633 entry->data_save = 634 readl(base + j * PCI_MSIX_ENTRY_SIZE + 635 PCI_MSIX_ENTRY_DATA_OFFSET); 636 637 tail = msi_desc[vector]->link.tail; 638 vector = tail; 639 } 640 dev->irq = temp; 641 642 disable_msi_mode(dev, pos, PCI_CAP_ID_MSIX); 643 save_state->cap_nr = PCI_CAP_ID_MSIX; 644 pci_add_saved_cap(dev, save_state); 645 return 0; 646} 647 648void pci_restore_msix_state(struct pci_dev *dev) 649{ 650 u16 save; 651 int pos; 652 int vector, head, tail = 0; 653 void __iomem *base; 654 int j; 655 struct msi_desc *entry; 656 int temp; 657 struct pci_cap_saved_state *save_state; 658 659 save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSIX); 660 if (!save_state) 661 return; 662 save = *((u16 *)&save_state->data[0]); 663 pci_remove_saved_cap(save_state); 664 kfree(save_state); 665 666 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); 667 if (pos <= 0) 668 return; 669 670 /* route the table */ 671 temp = dev->irq; 672 if (msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) 673 return; 674 vector = head = dev->irq; 675 while (head != tail) { 676 entry = msi_desc[vector]; 677 base = entry->mask_base; 678 j = entry->msi_attrib.entry_nr; 679 680 writel(entry->address_lo_save, 681 base + j * PCI_MSIX_ENTRY_SIZE + 682 PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET); 683 writel(entry->address_hi_save, 684 base + j * PCI_MSIX_ENTRY_SIZE + 685 PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET); 686 writel(entry->data_save, 687 base + j * PCI_MSIX_ENTRY_SIZE + 688 PCI_MSIX_ENTRY_DATA_OFFSET); 689 690 tail = msi_desc[vector]->link.tail; 691 vector = tail; 692 } 693 dev->irq = temp; 694 695 pci_write_config_word(dev, msi_control_reg(pos), save); 696 enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX); 697} 698#endif 699 700static int msi_register_init(struct pci_dev *dev, struct msi_desc *entry) 701{ 702 int status; 703 u32 address_hi; 704 u32 address_lo; 705 u32 data; 706 int pos, vector = dev->irq; 707 u16 control; 708 709 pos = pci_find_capability(dev, PCI_CAP_ID_MSI); 710 pci_read_config_word(dev, msi_control_reg(pos), &control); 711 712 /* Configure MSI capability structure */ 713 status = msi_ops->setup(dev, vector, &address_hi, &address_lo, &data); 714 if (status < 0) 715 return status; 716 717 pci_write_config_dword(dev, msi_lower_address_reg(pos), address_lo); 718 if (is_64bit_address(control)) { 719 pci_write_config_dword(dev, 720 msi_upper_address_reg(pos), address_hi); 721 pci_write_config_word(dev, 722 msi_data_reg(pos, 1), data); 723 } else 724 pci_write_config_word(dev, 725 msi_data_reg(pos, 0), data); 726 if (entry->msi_attrib.maskbit) { 727 unsigned int maskbits, temp; 728 /* All MSIs are unmasked by default, Mask them all */ 729 pci_read_config_dword(dev, 730 msi_mask_bits_reg(pos, is_64bit_address(control)), 731 &maskbits); 732 temp = (1 << multi_msi_capable(control)); 733 temp = ((temp - 1) & ~temp); 734 maskbits |= temp; 735 pci_write_config_dword(dev, 736 msi_mask_bits_reg(pos, is_64bit_address(control)), 737 maskbits); 738 } 739 740 return 0; 741} 742 743/** 744 * msi_capability_init - configure device's MSI capability structure 745 * @dev: pointer to the pci_dev data structure of MSI device function 746 * 747 * Setup the MSI capability structure of device function with a single 748 * MSI vector, regardless of device function is capable of handling 749 * multiple messages. A return of zero indicates the successful setup 750 * of an entry zero with the new MSI vector or non-zero for otherwise. 751 **/ 752static int msi_capability_init(struct pci_dev *dev) 753{ 754 int status; 755 struct msi_desc *entry; 756 int pos, vector; 757 u16 control; 758 759 pos = pci_find_capability(dev, PCI_CAP_ID_MSI); 760 pci_read_config_word(dev, msi_control_reg(pos), &control); 761 /* MSI Entry Initialization */ 762 entry = alloc_msi_entry(); 763 if (!entry) 764 return -ENOMEM; 765 766 vector = get_msi_vector(dev); 767 if (vector < 0) { 768 kmem_cache_free(msi_cachep, entry); 769 return -EBUSY; 770 } 771 entry->link.head = vector; 772 entry->link.tail = vector; 773 entry->msi_attrib.type = PCI_CAP_ID_MSI; 774 entry->msi_attrib.state = 0; /* Mark it not active */ 775 entry->msi_attrib.entry_nr = 0; 776 entry->msi_attrib.maskbit = is_mask_bit_support(control); 777 entry->msi_attrib.default_vector = dev->irq; /* Save IOAPIC IRQ */ 778 dev->irq = vector; 779 entry->dev = dev; 780 if (is_mask_bit_support(control)) { 781 entry->mask_base = (void __iomem *)(long)msi_mask_bits_reg(pos, 782 is_64bit_address(control)); 783 } 784 /* Replace with MSI handler */ 785 irq_handler_init(PCI_CAP_ID_MSI, vector, entry->msi_attrib.maskbit); 786 /* Configure MSI capability structure */ 787 status = msi_register_init(dev, entry); 788 if (status != 0) { 789 dev->irq = entry->msi_attrib.default_vector; 790 kmem_cache_free(msi_cachep, entry); 791 return status; 792 } 793 794 attach_msi_entry(entry, vector); 795 /* Set MSI enabled bits */ 796 enable_msi_mode(dev, pos, PCI_CAP_ID_MSI); 797 798 return 0; 799} 800 801/** 802 * msix_capability_init - configure device's MSI-X capability 803 * @dev: pointer to the pci_dev data structure of MSI-X device function 804 * @entries: pointer to an array of struct msix_entry entries 805 * @nvec: number of @entries 806 * 807 * Setup the MSI-X capability structure of device function with a 808 * single MSI-X vector. A return of zero indicates the successful setup of 809 * requested MSI-X entries with allocated vectors or non-zero for otherwise. 810 **/ 811static int msix_capability_init(struct pci_dev *dev, 812 struct msix_entry *entries, int nvec) 813{ 814 struct msi_desc *head = NULL, *tail = NULL, *entry = NULL; 815 u32 address_hi; 816 u32 address_lo; 817 u32 data; 818 int status; 819 int vector, pos, i, j, nr_entries, temp = 0; 820 unsigned long phys_addr; 821 u32 table_offset; 822 u16 control; 823 u8 bir; 824 void __iomem *base; 825 826 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); 827 /* Request & Map MSI-X table region */ 828 pci_read_config_word(dev, msi_control_reg(pos), &control); 829 nr_entries = multi_msix_capable(control); 830 831 pci_read_config_dword(dev, msix_table_offset_reg(pos), &table_offset); 832 bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK); 833 table_offset &= ~PCI_MSIX_FLAGS_BIRMASK; 834 phys_addr = pci_resource_start (dev, bir) + table_offset; 835 base = ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE); 836 if (base == NULL) 837 return -ENOMEM; 838 839 /* MSI-X Table Initialization */ 840 for (i = 0; i < nvec; i++) { 841 entry = alloc_msi_entry(); 842 if (!entry) 843 break; 844 vector = get_msi_vector(dev); 845 if (vector < 0) { 846 kmem_cache_free(msi_cachep, entry); 847 break; 848 } 849 850 j = entries[i].entry; 851 entries[i].vector = vector; 852 entry->msi_attrib.type = PCI_CAP_ID_MSIX; 853 entry->msi_attrib.state = 0; /* Mark it not active */ 854 entry->msi_attrib.entry_nr = j; 855 entry->msi_attrib.maskbit = 1; 856 entry->msi_attrib.default_vector = dev->irq; 857 entry->dev = dev; 858 entry->mask_base = base; 859 if (!head) { 860 entry->link.head = vector; 861 entry->link.tail = vector; 862 head = entry; 863 } else { 864 entry->link.head = temp; 865 entry->link.tail = tail->link.tail; 866 tail->link.tail = vector; 867 head->link.head = vector; 868 } 869 temp = vector; 870 tail = entry; 871 /* Replace with MSI-X handler */ 872 irq_handler_init(PCI_CAP_ID_MSIX, vector, 1); 873 /* Configure MSI-X capability structure */ 874 status = msi_ops->setup(dev, vector, 875 &address_hi, 876 &address_lo, 877 &data); 878 if (status < 0) 879 break; 880 881 writel(address_lo, 882 base + j * PCI_MSIX_ENTRY_SIZE + 883 PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET); 884 writel(address_hi, 885 base + j * PCI_MSIX_ENTRY_SIZE + 886 PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET); 887 writel(data, 888 base + j * PCI_MSIX_ENTRY_SIZE + 889 PCI_MSIX_ENTRY_DATA_OFFSET); 890 attach_msi_entry(entry, vector); 891 } 892 if (i != nvec) { 893 i--; 894 for (; i >= 0; i--) { 895 vector = (entries + i)->vector; 896 msi_free_vector(dev, vector, 0); 897 (entries + i)->vector = 0; 898 } 899 return -EBUSY; 900 } 901 /* Set MSI-X enabled bits */ 902 enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX); 903 904 return 0; 905} 906 907/** 908 * pci_enable_msi - configure device's MSI capability structure 909 * @dev: pointer to the pci_dev data structure of MSI device function 910 * 911 * Setup the MSI capability structure of device function with 912 * a single MSI vector upon its software driver call to request for 913 * MSI mode enabled on its hardware device function. A return of zero 914 * indicates the successful setup of an entry zero with the new MSI 915 * vector or non-zero for otherwise. 916 **/ 917int pci_enable_msi(struct pci_dev* dev) 918{ 919 struct pci_bus *bus; 920 int pos, temp, status = -EINVAL; 921 u16 control; 922 923 if (!pci_msi_enable || !dev) 924 return status; 925 926 if (dev->no_msi) 927 return status; 928 929 for (bus = dev->bus; bus; bus = bus->parent) 930 if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI) 931 return -EINVAL; 932 933 temp = dev->irq; 934 935 status = msi_init(); 936 if (status < 0) 937 return status; 938 939 pos = pci_find_capability(dev, PCI_CAP_ID_MSI); 940 if (!pos) 941 return -EINVAL; 942 943 pci_read_config_word(dev, msi_control_reg(pos), &control); 944 if (control & PCI_MSI_FLAGS_ENABLE) 945 return 0; /* Already in MSI mode */ 946 947 if (!msi_lookup_vector(dev, PCI_CAP_ID_MSI)) { 948 /* Lookup Sucess */ 949 unsigned long flags; 950 951 spin_lock_irqsave(&msi_lock, flags); 952 if (!vector_irq[dev->irq]) { 953 msi_desc[dev->irq]->msi_attrib.state = 0; 954 vector_irq[dev->irq] = -1; 955 nr_released_vectors--; 956 spin_unlock_irqrestore(&msi_lock, flags); 957 status = msi_register_init(dev, msi_desc[dev->irq]); 958 if (status == 0) 959 enable_msi_mode(dev, pos, PCI_CAP_ID_MSI); 960 return status; 961 } 962 spin_unlock_irqrestore(&msi_lock, flags); 963 dev->irq = temp; 964 } 965 /* Check whether driver already requested for MSI-X vectors */ 966 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); 967 if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { 968 printk(KERN_INFO "PCI: %s: Can't enable MSI. " 969 "Device already has MSI-X vectors assigned\n", 970 pci_name(dev)); 971 dev->irq = temp; 972 return -EINVAL; 973 } 974 status = msi_capability_init(dev); 975 if (!status) { 976 if (!pos) 977 nr_reserved_vectors--; /* Only MSI capable */ 978 else if (nr_msix_devices > 0) 979 nr_msix_devices--; /* Both MSI and MSI-X capable, 980 but choose enabling MSI */ 981 } 982 983 return status; 984} 985 986void pci_disable_msi(struct pci_dev* dev) 987{ 988 struct msi_desc *entry; 989 int pos, default_vector; 990 u16 control; 991 unsigned long flags; 992 993 if (!pci_msi_enable) 994 return; 995 if (!dev) 996 return; 997 998 pos = pci_find_capability(dev, PCI_CAP_ID_MSI); 999 if (!pos) 1000 return; 1001 1002 pci_read_config_word(dev, msi_control_reg(pos), &control); 1003 if (!(control & PCI_MSI_FLAGS_ENABLE)) 1004 return; 1005 1006 spin_lock_irqsave(&msi_lock, flags); 1007 entry = msi_desc[dev->irq]; 1008 if (!entry || !entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) { 1009 spin_unlock_irqrestore(&msi_lock, flags); 1010 return; 1011 } 1012 if (entry->msi_attrib.state) { 1013 spin_unlock_irqrestore(&msi_lock, flags); 1014 printk(KERN_WARNING "PCI: %s: pci_disable_msi() called without " 1015 "free_irq() on MSI vector %d\n", 1016 pci_name(dev), dev->irq); 1017 BUG_ON(entry->msi_attrib.state > 0); 1018 } else { 1019 vector_irq[dev->irq] = 0; /* free it */ 1020 nr_released_vectors++; 1021 default_vector = entry->msi_attrib.default_vector; 1022 spin_unlock_irqrestore(&msi_lock, flags); 1023 /* Restore dev->irq to its default pin-assertion vector */ 1024 dev->irq = default_vector; 1025 disable_msi_mode(dev, pci_find_capability(dev, PCI_CAP_ID_MSI), 1026 PCI_CAP_ID_MSI); 1027 } 1028} 1029 1030static int msi_free_vector(struct pci_dev* dev, int vector, int reassign) 1031{ 1032 struct msi_desc *entry; 1033 int head, entry_nr, type; 1034 void __iomem *base; 1035 unsigned long flags; 1036 1037 msi_ops->teardown(vector); 1038 1039 spin_lock_irqsave(&msi_lock, flags); 1040 entry = msi_desc[vector]; 1041 if (!entry || entry->dev != dev) { 1042 spin_unlock_irqrestore(&msi_lock, flags); 1043 return -EINVAL; 1044 } 1045 type = entry->msi_attrib.type; 1046 entry_nr = entry->msi_attrib.entry_nr; 1047 head = entry->link.head; 1048 base = entry->mask_base; 1049 msi_desc[entry->link.head]->link.tail = entry->link.tail; 1050 msi_desc[entry->link.tail]->link.head = entry->link.head; 1051 entry->dev = NULL; 1052 if (!reassign) { 1053 vector_irq[vector] = 0; 1054 nr_released_vectors++; 1055 } 1056 msi_desc[vector] = NULL; 1057 spin_unlock_irqrestore(&msi_lock, flags); 1058 1059 kmem_cache_free(msi_cachep, entry); 1060 1061 if (type == PCI_CAP_ID_MSIX) { 1062 if (!reassign) 1063 writel(1, base + 1064 entry_nr * PCI_MSIX_ENTRY_SIZE + 1065 PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET); 1066 1067 if (head == vector) { 1068 /* 1069 * Detect last MSI-X vector to be released. 1070 * Release the MSI-X memory-mapped table. 1071 */ 1072#if 0 1073 int pos, nr_entries; 1074 unsigned long phys_addr; 1075 u32 table_offset; 1076 u16 control; 1077 u8 bir; 1078 1079 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); 1080 pci_read_config_word(dev, msi_control_reg(pos), 1081 &control); 1082 nr_entries = multi_msix_capable(control); 1083 pci_read_config_dword(dev, msix_table_offset_reg(pos), 1084 &table_offset); 1085 bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK); 1086 table_offset &= ~PCI_MSIX_FLAGS_BIRMASK; 1087 phys_addr = pci_resource_start(dev, bir) + table_offset; 1088/* 1089 * FIXME! and what did you want to do with phys_addr? 1090 */ 1091#endif 1092 iounmap(base); 1093 } 1094 } 1095 1096 return 0; 1097} 1098 1099static int reroute_msix_table(int head, struct msix_entry *entries, int *nvec) 1100{ 1101 int vector = head, tail = 0; 1102 int i, j = 0, nr_entries = 0; 1103 void __iomem *base; 1104 unsigned long flags; 1105 1106 spin_lock_irqsave(&msi_lock, flags); 1107 while (head != tail) { 1108 nr_entries++; 1109 tail = msi_desc[vector]->link.tail; 1110 if (entries[0].entry == msi_desc[vector]->msi_attrib.entry_nr) 1111 j = vector; 1112 vector = tail; 1113 } 1114 if (*nvec > nr_entries) { 1115 spin_unlock_irqrestore(&msi_lock, flags); 1116 *nvec = nr_entries; 1117 return -EINVAL; 1118 } 1119 vector = ((j > 0) ? j : head); 1120 for (i = 0; i < *nvec; i++) { 1121 j = msi_desc[vector]->msi_attrib.entry_nr; 1122 msi_desc[vector]->msi_attrib.state = 0; /* Mark it not active */ 1123 vector_irq[vector] = -1; /* Mark it busy */ 1124 nr_released_vectors--; 1125 entries[i].vector = vector; 1126 if (j != (entries + i)->entry) { 1127 base = msi_desc[vector]->mask_base; 1128 msi_desc[vector]->msi_attrib.entry_nr = 1129 (entries + i)->entry; 1130 writel( readl(base + j * PCI_MSIX_ENTRY_SIZE + 1131 PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET), base + 1132 (entries + i)->entry * PCI_MSIX_ENTRY_SIZE + 1133 PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET); 1134 writel( readl(base + j * PCI_MSIX_ENTRY_SIZE + 1135 PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET), base + 1136 (entries + i)->entry * PCI_MSIX_ENTRY_SIZE + 1137 PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET); 1138 writel( (readl(base + j * PCI_MSIX_ENTRY_SIZE + 1139 PCI_MSIX_ENTRY_DATA_OFFSET) & 0xff00) | vector, 1140 base + (entries+i)->entry*PCI_MSIX_ENTRY_SIZE + 1141 PCI_MSIX_ENTRY_DATA_OFFSET); 1142 } 1143 vector = msi_desc[vector]->link.tail; 1144 } 1145 spin_unlock_irqrestore(&msi_lock, flags); 1146 1147 return 0; 1148} 1149 1150/** 1151 * pci_enable_msix - configure device's MSI-X capability structure 1152 * @dev: pointer to the pci_dev data structure of MSI-X device function 1153 * @entries: pointer to an array of MSI-X entries 1154 * @nvec: number of MSI-X vectors requested for allocation by device driver 1155 * 1156 * Setup the MSI-X capability structure of device function with the number 1157 * of requested vectors upon its software driver call to request for 1158 * MSI-X mode enabled on its hardware device function. A return of zero 1159 * indicates the successful configuration of MSI-X capability structure 1160 * with new allocated MSI-X vectors. A return of < 0 indicates a failure. 1161 * Or a return of > 0 indicates that driver request is exceeding the number 1162 * of vectors available. Driver should use the returned value to re-send 1163 * its request. 1164 **/ 1165int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) 1166{ 1167 struct pci_bus *bus; 1168 int status, pos, nr_entries, free_vectors; 1169 int i, j, temp; 1170 u16 control; 1171 unsigned long flags; 1172 1173 if (!pci_msi_enable || !dev || !entries) 1174 return -EINVAL; 1175 1176 if (dev->no_msi) 1177 return -EINVAL; 1178 1179 for (bus = dev->bus; bus; bus = bus->parent) 1180 if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI) 1181 return -EINVAL; 1182 1183 status = msi_init(); 1184 if (status < 0) 1185 return status; 1186 1187 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); 1188 if (!pos) 1189 return -EINVAL; 1190 1191 pci_read_config_word(dev, msi_control_reg(pos), &control); 1192 if (control & PCI_MSIX_FLAGS_ENABLE) 1193 return -EINVAL; /* Already in MSI-X mode */ 1194 1195 nr_entries = multi_msix_capable(control); 1196 if (nvec > nr_entries) 1197 return -EINVAL; 1198 1199 /* Check for any invalid entries */ 1200 for (i = 0; i < nvec; i++) { 1201 if (entries[i].entry >= nr_entries) 1202 return -EINVAL; /* invalid entry */ 1203 for (j = i + 1; j < nvec; j++) { 1204 if (entries[i].entry == entries[j].entry) 1205 return -EINVAL; /* duplicate entry */ 1206 } 1207 } 1208 temp = dev->irq; 1209 if (!msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { 1210 /* Lookup Sucess */ 1211 nr_entries = nvec; 1212 /* Reroute MSI-X table */ 1213 if (reroute_msix_table(dev->irq, entries, &nr_entries)) { 1214 /* #requested > #previous-assigned */ 1215 dev->irq = temp; 1216 return nr_entries; 1217 } 1218 dev->irq = temp; 1219 enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX); 1220 return 0; 1221 } 1222 /* Check whether driver already requested for MSI vector */ 1223 if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0 && 1224 !msi_lookup_vector(dev, PCI_CAP_ID_MSI)) { 1225 printk(KERN_INFO "PCI: %s: Can't enable MSI-X. " 1226 "Device already has an MSI vector assigned\n", 1227 pci_name(dev)); 1228 dev->irq = temp; 1229 return -EINVAL; 1230 } 1231 1232 spin_lock_irqsave(&msi_lock, flags); 1233 /* 1234 * msi_lock is provided to ensure that enough vectors resources are 1235 * available before granting. 1236 */ 1237 free_vectors = pci_vector_resources(last_alloc_vector, 1238 nr_released_vectors); 1239 /* Ensure that each MSI/MSI-X device has one vector reserved by 1240 default to avoid any MSI-X driver to take all available 1241 resources */ 1242 free_vectors -= nr_reserved_vectors; 1243 /* Find the average of free vectors among MSI-X devices */ 1244 if (nr_msix_devices > 0) 1245 free_vectors /= nr_msix_devices; 1246 spin_unlock_irqrestore(&msi_lock, flags); 1247 1248 if (nvec > free_vectors) { 1249 if (free_vectors > 0) 1250 return free_vectors; 1251 else 1252 return -EBUSY; 1253 } 1254 1255 status = msix_capability_init(dev, entries, nvec); 1256 if (!status && nr_msix_devices > 0) 1257 nr_msix_devices--; 1258 1259 return status; 1260} 1261 1262void pci_disable_msix(struct pci_dev* dev) 1263{ 1264 int pos, temp; 1265 u16 control; 1266 1267 if (!pci_msi_enable) 1268 return; 1269 if (!dev) 1270 return; 1271 1272 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); 1273 if (!pos) 1274 return; 1275 1276 pci_read_config_word(dev, msi_control_reg(pos), &control); 1277 if (!(control & PCI_MSIX_FLAGS_ENABLE)) 1278 return; 1279 1280 temp = dev->irq; 1281 if (!msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { 1282 int state, vector, head, tail = 0, warning = 0; 1283 unsigned long flags; 1284 1285 vector = head = dev->irq; 1286 spin_lock_irqsave(&msi_lock, flags); 1287 while (head != tail) { 1288 state = msi_desc[vector]->msi_attrib.state; 1289 if (state) 1290 warning = 1; 1291 else { 1292 vector_irq[vector] = 0; /* free it */ 1293 nr_released_vectors++; 1294 } 1295 tail = msi_desc[vector]->link.tail; 1296 vector = tail; 1297 } 1298 spin_unlock_irqrestore(&msi_lock, flags); 1299 if (warning) { 1300 dev->irq = temp; 1301 printk(KERN_WARNING "PCI: %s: pci_disable_msix() called without " 1302 "free_irq() on all MSI-X vectors\n", 1303 pci_name(dev)); 1304 BUG_ON(warning > 0); 1305 } else { 1306 dev->irq = temp; 1307 disable_msi_mode(dev, 1308 pci_find_capability(dev, PCI_CAP_ID_MSIX), 1309 PCI_CAP_ID_MSIX); 1310 1311 } 1312 } 1313} 1314 1315/** 1316 * msi_remove_pci_irq_vectors - reclaim MSI(X) vectors to unused state 1317 * @dev: pointer to the pci_dev data structure of MSI(X) device function 1318 * 1319 * Being called during hotplug remove, from which the device function 1320 * is hot-removed. All previous assigned MSI/MSI-X vectors, if 1321 * allocated for this device function, are reclaimed to unused state, 1322 * which may be used later on. 1323 **/ 1324void msi_remove_pci_irq_vectors(struct pci_dev* dev) 1325{ 1326 int state, pos, temp; 1327 unsigned long flags; 1328 1329 if (!pci_msi_enable || !dev) 1330 return; 1331 1332 temp = dev->irq; /* Save IOAPIC IRQ */ 1333 pos = pci_find_capability(dev, PCI_CAP_ID_MSI); 1334 if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSI)) { 1335 spin_lock_irqsave(&msi_lock, flags); 1336 state = msi_desc[dev->irq]->msi_attrib.state; 1337 spin_unlock_irqrestore(&msi_lock, flags); 1338 if (state) { 1339 printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() " 1340 "called without free_irq() on MSI vector %d\n", 1341 pci_name(dev), dev->irq); 1342 BUG_ON(state > 0); 1343 } else /* Release MSI vector assigned to this device */ 1344 msi_free_vector(dev, dev->irq, 0); 1345 dev->irq = temp; /* Restore IOAPIC IRQ */ 1346 } 1347 pos = pci_find_capability(dev, PCI_CAP_ID_MSIX); 1348 if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) { 1349 int vector, head, tail = 0, warning = 0; 1350 void __iomem *base = NULL; 1351 1352 vector = head = dev->irq; 1353 while (head != tail) { 1354 spin_lock_irqsave(&msi_lock, flags); 1355 state = msi_desc[vector]->msi_attrib.state; 1356 tail = msi_desc[vector]->link.tail; 1357 base = msi_desc[vector]->mask_base; 1358 spin_unlock_irqrestore(&msi_lock, flags); 1359 if (state) 1360 warning = 1; 1361 else if (vector != head) /* Release MSI-X vector */ 1362 msi_free_vector(dev, vector, 0); 1363 vector = tail; 1364 } 1365 msi_free_vector(dev, vector, 0); 1366 if (warning) { 1367 /* Force to release the MSI-X memory-mapped table */ 1368#if 0 1369 unsigned long phys_addr; 1370 u32 table_offset; 1371 u16 control; 1372 u8 bir; 1373 1374 pci_read_config_word(dev, msi_control_reg(pos), 1375 &control); 1376 pci_read_config_dword(dev, msix_table_offset_reg(pos), 1377 &table_offset); 1378 bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK); 1379 table_offset &= ~PCI_MSIX_FLAGS_BIRMASK; 1380 phys_addr = pci_resource_start(dev, bir) + table_offset; 1381/* 1382 * FIXME! and what did you want to do with phys_addr? 1383 */ 1384#endif 1385 iounmap(base); 1386 printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() " 1387 "called without free_irq() on all MSI-X vectors\n", 1388 pci_name(dev)); 1389 BUG_ON(warning > 0); 1390 } 1391 dev->irq = temp; /* Restore IOAPIC IRQ */ 1392 } 1393} 1394 1395void pci_no_msi(void) 1396{ 1397 pci_msi_enable = 0; 1398} 1399 1400EXPORT_SYMBOL(pci_enable_msi); 1401EXPORT_SYMBOL(pci_disable_msi); 1402EXPORT_SYMBOL(pci_enable_msix); 1403EXPORT_SYMBOL(pci_disable_msix); 1404